Sensor ya Ubwino wa Dothi

Kodi mungatiuze zambiri za zotsatira za mchere pazotsatira?Kodi pali mtundu wina wa capacitive zotsatira za magawo awiri a ayoni m'nthaka?

Zingakhale zabwino ngati mungandilozere zambiri za izi.Ndili ndi chidwi chopanga miyeso yolondola kwambiri ya chinyezi munthaka.

Tangoganizani ngati pamakhala chowongolera changwiro kuzungulira sensa (mwachitsanzo, ngati sensayo idamizidwa muzitsulo zamadzimadzi), imatha kulumikiza mbale za capacitor wina ndi mnzake kuti chotchingira chokhacho pakati pawo chikhale chopaka chopyapyala chocheperako. bolodi lozungulira.

Masensa otsika mtengo awa, omangidwa pa tchipisi 555, nthawi zambiri amagwira ntchito pafupipafupi mu makumi a kHz, omwe ndi otsika kwambiri kuti athetse mphamvu ya mchere wosungunuka.Zitha kukhala zotsika kwambiri kuti zibweretse mavuto ena monga kuyamwa kwa dielectric, komwe kumawonekera ngati hysteresis.

Dziwani kuti gulu la sensa kwenikweni ndi capacitor motsatizana ndi dera lofanana ndi dothi, limodzi mbali iliyonse.Mutha kugwiritsanso ntchito ma elekitirodi osatetezedwa popanda zokutira kuti mulumikizane mwachindunji, koma ma elekitirodi amatha kusungunuka m'nthaka.Kugwiritsa ntchito gawo lamagetsi kumayambitsa polarization mu nthaka + malo amadzi.Chilolezo chovuta chimayesedwa ngati ntchito ya magetsi ogwiritsidwa ntchito, kotero kuti polarization ya zinthuzo nthawi zonse imakhala kumbuyo kwa magetsi ogwiritsidwa ntchito.Pamene mafupipafupi a malo ogwiritsidwa ntchito akuwonjezeka mumtundu wapamwamba wa MHz, gawo lolingalira la dielectric nthawi zonse limatsika kwambiri pamene dipole polarization sichimatsatiranso kutsika kwapamwamba kwa magetsi.

Pansi pa ~ 500 MHz, gawo lolingaliridwa la dielectric nthawi zonse limayendetsedwa ndi mchere ndipo, chifukwa chake, kuwongolera.Pamwamba pa ma frequency awa, dipole polarization idzachepa kwambiri ndipo kukhazikika kwa dielectric kumatengera madzi.

Masensa ambiri azamalonda amathetsa vutoli pogwiritsa ntchito ma frequency ocheperako ndikugwiritsa ntchito ma curve calibration kuti awerengere kuchuluka kwa nthaka ndi ma frequency.